Overfall sampling device



April 13, 1943;

B. H. HENDRICKSON OVERFALL SAMPLING DEVICE 5 Sheets-Sh eet 1 Filed Oct.16, 1941 "wag B.H.HENDRICKSON ATTORNEYS April '13, 1943'.

B. H. HENDRICKSON OVERFALL SAMPLING DEVICE Filed Oct. 16. 1941 I 5Sheets-Sheet 2 INVENTBQ B.H.HENDRICKSON ATTORNEYS nim) I a-z-l April 13,1943.

5.1-1. HENDRICKSON I 2,316,537 OVERFALL SAMPLING DEVICE I 5 Sheets-Sheet :5

Filed Oct. 16, 1941 INVENTQR B H HENDRICKSON ATTORNEYS April 13, 1943-B; H. HENDRIICKSON 2,316,537

OVERFALL SAMPLING DEVICE FiledOct. 16, 194; 5 Shee ts-Sheefl 4 E l l I El l INVENTOR B.H.HENDR|CKSQN ATTORNEYS A ril 13, '1943.

B. H. HENDRiQKSON' OVERFALL SAMPLING DEVICE 5 Sheets-Sheet 5 Filed Oct.16, 1941 INVENTORC" B;H.HENDRYICKSON ATTORN EYS Patented Apr. 13, 1943UNITED STATES PATENT OFFICE 1 QVERFALL SAMPLING DEVICE Bertram H.Hendrickson, Athens, .Ga., assignor to Claude R. Wickard, as Secretaryof Agriculture of the United States of America and to his successors inoflice (Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 O. G. 757) Claims.

This application is made under the act of March 3, 1883, as amended bythe act of April 30,

1928, and the invention herein described, if patented, may bemanufactured and used by or for the Goverrm'ient cf the United States ofAmerica for governmental purposes without the payment to me of anyroyalty thereon.

This invention relates to a device which is adapted to be placed in afluid overfall, the'general object of which is to collect asubstantially constant fraction of the fluid, which may be Water thatcontains soil, for the purpose of obtaining a sample of the fluid to besubmitted to analysis. v

A specific object of this invention is the provision of such a devicewhich is automatic in operation and which willcollect a substantiallyconstant fraction of the overfall overwlde ranges of dischargefluctuations thereof.

. In the accompanying drawings, there is illus- I trated an embodimentof my invention, in which:

the embodiment illustrated comprises a suitable frame structure II inwhich there is mounted a waterwheel or turbine l21' ixed to an axle l3,said axle being rotatable in bearings l4 and l5 on frame members l6 andI1. Above the waterwheel I 2 ismounted a trough l8 which guides theoverfall to a point over the waterwheel so as to impingepupon its bladesand rotate it, thereby rotating the axle l3. Splash walls I9 and aremounted between the sides of the frame structure and the waterwheel I2.

Between'the waterwheel I2 andthe trough l8,

which a belt 25, preferably of the V type, travels. Around the belt 25there are spaced a number of projections 26, such aspieces of wire,which travel through. the slot 22 and scavenge it of any deposits whichmight prevent the passage of fluid through the slot into the housing 2|.

Through the bottom of the housing 2i, near the forward end, an outlet 21is provided, which outlet is connected to a tube 28, such as a commonrubber hose, to carry off fluids which collect in thehousingZl. V I

The pulley 241s fixed to a horizontal shaft 29 which projects throughbearings 30 and 3 l in the side walls of the housing 2|, in whichbearings said shaft is rotatably mounted and extends on both sidestherefrom where the ends of said shaft are rotatably ,mounted inbearings, 32 and 33 attached to thelower end of vertical supportingmembers and 35. The upper ends of the sup.- porting members 34 and 35are connected to a horizontal bar 36, to which there is attached"grooved ro1 1er s,,3'l and 38 which ride on a horizontal tracker runner39secured to brackets Ail and ll depending from the frame of the device.Therollers 31 andf38 are held on the track 39 by means of atrunnionroller 42 which abuts the underside of ,a horizontal runway 43 securedto the track 39'. This roller 42 is mounted on a bracket 44 which, isattached to the horizontal bar 36.

. The belt 2 5,is driven by power, appliedto the pulley 23 from ahorizontal shaft 45. The shaft 4.5is .of a. square cross-section or of someother suitable non-circular shape, and engages a com-.plementaryaperturejfi through the pulley 23.

The pulley23, however, is not fixed tov the shaft 45, but is axiallyslidable thereon. The shaft 45 is rotatably, mounted in bearings 41 and28, at

which points it may be of a circular cross-section, on frame members 49and50, which are disposed in a direction parallel to the slope of thehousing 2|; Acrossthe frame members 49 and 50 there is disposed a fiatbearing surface, such as a plate 5|, upon which a roller 52 travelslaterally, which rollersupports the rearward end of an extension 53 ofthe housing'2l. The rearward end of the extension 53 is also swiveledtothe mounting 55 of a pulley.55 by. means of a bolt 56, which pulleyengages' a horizontal track 57 secured across back frame members 58 and59. The pulley 55 is maintained in contact with the track 51 by means of.a spring. 60,,one end of which abuts the end of the extension 53. andthe other end of which abuts themounting 54.

The shaft 45 extends through the bearing 41 to receive a pulley 6|,which is belt-connected to another pulley 62 fixed to the axle l3,substantially as shown. In this manner rotation of the waterwheel 12causes the shaft 45 to rotate.

The housing 2! is urged to one side of the waterwheel l2 by means ofweights 63 and 64 attached to one end of cables 65 and 66 the other endbeing attached to the extension member 53 and the bar 36, respectively,said cables operating over pulleys or sheaves '61. and 68 on the frameof the device.

On the side of the device opposite the weights B3 and 64, means areprovided for moving the housing 2| across the width of the overfallagainst the action of said weights. These means comprises a pulley 69fixed to the shaft 45 which is belt-connected to a pulley of. the axlel3. There is also mounted on the shaft 45 acam H, preferably of ahyperbolic curvature, which is. fixed to the pulley" 69, by means ofbolts 12 soas to rotatetherewith. lThecam "H. operates against a rollerl3v fixed to the end ofa lever M, the other end. being pivoted. at l5torthelframe of the device. .Below the lever 14 another lever 16 ispivoted. at one end to the frame beneath the pivot and. is connected tothelever-"M by.

an arm TL which is pin-connectedat 18 to the lever 14 and at 19 to thelever 15.. Theother end of the lever 16 extends forwardly towhich thereis attached the ends of cables'8illand8l. Said cables pass over pulleys82. andv Bland. are attached to the bar and extension 54,. respectively.

In operation the overfall is directed through the trough I8 from whenceitimpinges upon the blades of the 'Waterwheel l2 causing it to rotate.This. also causes. the shaftto rotate, which. is belt geared to the axlel3. Rotation of. the shaft 45 causes the pulley 23 to rotatewhichcdrives thebelt 25 to. which. theprojections- 23-a1 e attached.'Rotation of the shaft 45..also causes the cam TI. to rotate,Whichoscillatesthe roller 13. This. oscillation is transmittedsto the.lever. 16. The weights E3-and64 urge thehousing 2| to the left, asviewed in Figure 3; 7 'When the. cam H operates to force the roller 13downward,.the cables 8ll and 8| pull the housingZ I. in the oppositedirection against the action of the weights 63 and- 64 until the roller.l'3.is in. itsextreme As the housing 21 movesfirst tothe right and rthen to the left across the width of .theovetfall, it receives a smallfraction of'fluid from .the overflow through the slot 22 which .isconstantly being scavenged .or cleaned by v.the projections 28' so that.a. true sample of the overfallisobtained at all times. In moving. fromone side to the other the pulley 23 slides axiallyover-the shaft 45while the rollers'31 and. 38 travel over the track 39. Atthe same time.the trunnion roller 52 rides on the plate-filland the pulley 55 ridesagainstthe track 51..

Variations in-the disohargeof the overfall varies the speed of thewaterwheel: l2 whichin turn varies the scanning speed. .of the housing2|. In. this manner the device collects substan tially the samepercentage or. fraction of the overfall at different discharges,assumingithatithe head of the overfall remainsconstant.

1. A device for obtaining a sample of a fluid overfall comprising awaterwheel actuatable by the overfall, a housing having a slot openingtherethrough narrower than the width of the overfall intersecting thetrajectory of the overfall, said housing being movable from one side ofthe overfall to the other, means urging said housing to one side of saidoverfall, and means actuated by said waterwheel for intermittentlyHaving thus described'my invention, I claim:

.movingsaid housing to the other side of the overfall against the actionof said first-mentioned means.

2. A device for obtaining a sample of a fluid overfall comprising awaterwheel actuatable by the overfall, a housing having a slot openingtherethrough narrower than the width of the overfall intersecting thetrajectory of the overfall, said housing being movable from one side ofthe-overfall to the other, means urging said housing to one side of saidoverfall,.means actuatedby said Waterwheel for. intermittently movingsaid housing tothe other. side ofthe overfall against the action ofsaidfirstementioned means. and means for continuously recovering the fluidswhich collect in said housing.

3. A device for obtaining a sample of a'fluid overfall. comprising. awaterwheel. actuatable. by

the overfall, a .housinghaving a slot opening therethrough narrower thanthe Width of the overfall intersecting the trajectory of the'overfall,

.said housing being movable fromone sideof the overfall to the other,.meansurgingv said housing to one side of said overfall, means actuatedby said waterwheel. for intermittently moving said housing. to the otherside of the overfall against the action of said first-mentioned meanaandmeans actuated bysaid waterwheelffor continuously scavenging said slot.

4. A. device forobtaining. asample of fluid overfall comprisingawaterwheel actuatable by the overfall, ahousing having .ajslotopeningtherethrough narrower than the width of the overfall intersecting.thetrajectoryrof the overfall, said housing .being movable from. oneside of the overfall to the other,.means urging said housing to one sideof .said. overfall, means actuated by said waterwheel. for'intermittently moving saidhousing tothe other. side of ltheoverfallagainst the action of said first-mentioned means, means for continuouslyrecovering the fluids which collect in said housing, and ,means actuatedbysaid waterwheel f0r.coritinu0l1sly scavenging saidslot.

.5.'A device for obtaining asample otafiuid overfall comprisingawaterwheel actuatable by the overfall, a housing having a slot openinghear" the ends of the slot, a belt frictionally engaging said pulleys,pins secured to said belt in spaced relation vthereabout, said pinsextending outwardly from said belt to project through said slot andscavenge it, and means for applying power from said waterwheel torotateone of said pulleys.

BERTRAM H. HENDRICKSON.

